package mao.thinkinjava.collection;

import java.util.*;

public class TestStack {
    public static void main(String[] args) {
        LinkedList<Integer> list = new LinkedList<>();
        //list.addFirst();
        list.removeLast();

        Deque<Integer> deque = new LinkedList<>();
        new HashMap<Integer,String>();
        String[] split = new String("HHH HHH").split(" ");
        for (String s:split
             ) {
            System.out.println();

        }
    }

    public class MyMap extends AbstractMap<Integer,String>{

        @Override
        public Set<Entry<Integer, String>> entrySet() {
            return null;
        }

    }

}
